body {
    padding: 0;
    margin: 0;
}

.blurDiv {
    width: 400px;
    height: 400px;
    margin: 50px auto 0;
    position: relative;
}

.blurImg {
    width: 400px;
    height: 400px;
}


/* 设置按钮效果 */

a {
    display: block;
    width: 100px;
    height: 60px;
    border-radius: 5px;
    line-height: 60px;
    text-align: center;
    position: absolute;
    top: 105%;
    font-size: 1.5em;
    color: aquamarine;
    text-decoration: none;
}

#buttonReset {
    left: 7%;
    background-color: PaleVioletRed;
}

#buttonShow {
    right: 7%;
    background-color: Violet;
}

#buttonReset:hover {
    background-color: LightPink;
}

#buttonShow:hover {
    background-color: plum;
}

.blurImg {
    width: 400px;
    height: 400px;
    /* 滤镜：模糊程度20px */
    filter: blur(20px);
}

#canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 400px;
    height: 400px;
}